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{{chembox
{{chembox
| Verifiedfields = changed
|ImageFile=Potassium pyrosulfate.png
| Watchedfields = changed
⚫
|ImageSize=
| verifiedrevid = 429083580
⚫
|IUPACName=dipotassium (sulfonatooxy)sulfonate
|OtherNames=Potassium pyrosulphate; potassium disulfate
| ImageFile=Potassium pyrosulfate.png
⚫
| ImageSize=
⚫
| IUPACName=dipotassium (sulfonatooxy)sulfonate
| OtherNames=Potassium pyrosulphate; potassium disulfate
|Section1={{Chembox Identifiers
|Section1={{Chembox Identifiers
| CASNo_Ref = {{cascite|correct|??}}
| CASNo=7790-62-7
| CASNo=7790-62-7
| PubChem=62681
| PubChem=62681
⚫
| SMILES=[O-]S(=O)(=O)OS(=O)(=O)[O-].[K+].[K+]
| EINECS = 232-216-8
| UNII = AVJ6ZST7L6
⚫
| SMILES=[O-]S(=O)(=O)OS(=O)(=O)[O-].[K+].[K+]
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 56432
| InChI = 1/2K.H2O7S2/c;;1-8(2,3)7-9(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2
| InChIKey = KAQHZJVQFBJKCK-NUQVWONBAQ
| StdInChI_Ref = {{stdinchicite|changed|chemspider}}
| StdInChI = 1S/2K.H2O7S2/c;;1-8(2,3)7-9(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2
| StdInChIKey_Ref = {{stdinchicite|changed|chemspider}}
| StdInChIKey = KAQHZJVQFBJKCK-UHFFFAOYSA-L

}}
}}
|Section2={{Chembox Properties
|Section2={{Chembox Properties
| K = 2 | O = 7 | S = 2
| K=2 | S=2 | O=7
| Appearance=
| Appearance=
| Density= 2.28 g/cm<sup>3</sup>
| Density= 2.28 g/cm<sup>3</sup>
| MeltingPtC= 325
| MeltingPtC= 325
| BoilingPtC=
| BoilingPtC=
| Solubility= soluble
| Solubility= 25.4 g/100 mL (20 °C)
}}
}}
|Section3={{Chembox Hazards
|Section3={{Chembox Hazards
| AutoignitionPt =
| Autoignition=
| FlashPt=
| FlashPt=
| MainHazards=
| MainHazards=
| NFPA-H =
| NFPA-H =
| NFPA-F =
| NFPA-F =
| NFPA-R =
| NFPA-R =
| NFPA-O =
| NFPA-S =
| PEL =
| PEL =
| RPhrases = {{R36}} {{R38}}
| GHSPictograms = {{GHS05}}{{GHS06}}
| SPhrases =
| GHSSignalWord = Danger
| HPhrases = {{H-phrases|314|331}}
| PPhrases = {{P-phrases|260|261|264|271|280|301+330+331|303+361+353|304+340|305+351+338|310|311|321|363|403+233|405|501}}
}}
}}
}}
}}


'''Potassium pyrosulfate''', or '''potassium disulfate''', is an [[inorganic compound]] with the [[chemical formula]] K<sub>2</sub>S<sub>2</sub>O<sub>7</sub>.
⚫
'''Potassium pyrosulfate''' (potassium disulfate) is a chemical compound, K<sub>2</sub>S<sub>2</sub>O<sub>7</sub>. It contains the [[pyrosulfate]] anion S<sub>2</sub>O<sub>7</sub><sup>2<nowiki>&minus;</nowiki></sup> which has a [[dichromate]] like structure and can be visualised as two corner sharing SO<sub>4</sub> tetrahedra, with a bridging oxygen atom.<ref>''The crystal structure determination and refinements of K<sub>2</sub>S<sub>2</sub>O<sub>7</sub>, KNaS<sub>2</sub>O<sub>7</sub> and Na<sub>2</sub>S<sub>2</sub>O<sub>7</sub> from X-ray powder and single crystal diffraction data'' Ståhl K , Balic-Zunic T, da Silva F, Eriksen K M , Berg R W Fehrmann R Journal of Solid State Chemistry 178, 1697-1704, (2005) {{doi|10.1016/j.jssc.2005.03.022}} </ref> A semi-structural formula for pyrosulfate ion is O<sub>3</sub>SOSO<sub>3</sub><sup>2<nowiki>&minus;</nowiki></sup>. In this compound sulfur has an [[oxidation state]] of +6.
⚫
Potassium pyrosulfate is used in analytical chemistry; samples are fused with potassium pyrosulfate, (or a mixture of potassium pyrosulfate and [[potassium fluoride]], KF) to ensure complete dissolution prior to a quantitative analysis.<ref>''Determination of quartz (free silica) in refractory clays'' Trostbl L.J., Wynne D.J. Journal of the American Ceramic Society 23 1 18, (1940) {{doi|10.1111/j.1151-2916.1940.tb14187.x}}</ref><ref>''Determination of gross alpha, plutonium, neptunium, and/or uranium by gross alpha counting on barium sulphate'' C. W. Sill Analytical Chemistry, (1980) 52, 1452</ref>


==Production==
It is also used as a catalyst in conjunction with [[vanadium(V) oxide]], for example.<ref>''Sulfur trioxide production'' BurkhardtD.B. US patent no. 3362786 issued Jan 1968,</ref>
Potassium pyrosulfate is obtained by the thermal decomposition of other salts, most directly from [[potassium bisulfate]]:<ref>{{cite book|last1=Washington Wiley|first1=Harvey|title=Principles and Practice of Agricultural Analysis: Fertilizers|date=1895|publisher=Chemical Publishing Co.|location=Easton, PA.|page=[https://archive.org/details/principlesandpr03wilegoog/page/n232 218]|url=https://archive.org/details/principlesandpr03wilegoog|quote=Potassium disulfate.|access-date=31 December 2015}}</ref>
: 2 KHSO<sub>4</sub> → K<sub>2</sub>S<sub>2</sub>O<sub>7</sub> + H<sub>2</sub>O
Temperatures above 600°C further decompose potassium pyrosulfate to [[potassium sulfate]] and [[sulfur trioxide]] however:<ref>{{cite book|last1=Iredelle Dillard Hinds|first1=John|title=Inorganic Chemistry: With the Elements of Physical and Theoretical Chemistry|date=1908|publisher=John Wiley & Sons.|location=New York|page=[https://archive.org/details/inorganicchemist00hinduoft/page/547 547]|url=https://archive.org/details/inorganicchemist00hinduoft|quote=Potassium disulfate.|access-date=31 December 2015}}</ref>
: K<sub>2</sub>S<sub>2</sub>O<sub>7</sub> → K<sub>2</sub>SO<sub>4</sub> + SO<sub>3</sub>

Other salts, such as [[potassium trisulfate]],<ref name="Georg">{{cite book|last=Brauer|first=Georg|title=Handbook of Preparative Inorganic Chemistry Vol. 2, 2nd Ed.|date=1963|publisher=Academic Press|location=New York|isbn=9780323161299|page=1716|url=https://books.google.com/books?id=Pef47TK5NfkC}}</ref> can also decompose into potassium pyrosulfate.

==Chemical structure==
⚫
Potassium pyrosulfate contains the [[pyrosulfate]] [[anion]] which has a [[dichromate]]-like [[Chemical structure|structure]]. The [[Molecular geometry|geometry]] can be visualized as a [[tetrahedron]] with two corners sharing the [[Sulfate|SO<sub>4</sub>]] anion's configuration and a centrally bridged oxygen atom.<ref>{{cite journal |title=The crystal structure determination and refinements of K<sub>2</sub>S<sub>2</sub>O<sub>7</sub>, KNaS<sub>2</sub>O<sub>7</sub> and Na<sub>2</sub>S<sub>2</sub>O<sub>7</sub> from X-ray powder and single crystal diffraction data |last=Ståhl |first=K. |last2=Balic-Zunic |first2=T. |last3=da Silva |first3=F. |last4=Eriksen |first4=K. M. |last5=Berg |first5=R. W. |last6=Fehrmann |first6=R. |journal=Journal of Solid State Chemistry |volume=178 |issue=5 |pages=1697–1704 |year=2005 |doi=10.1016/j.jssc.2005.03.022 |bibcode = 2005JSSCh.178.1697S |url=http://orbit.dtu.dk/en/publications/the-crystal-structure-determination-and-refinements-of-k2s2o7-knas2o7-and-na2s2o7-from-xray-powder-and-single-crystal-diffraction-data(9509b129-d51a-4a6b-8972-5cb4ca003ad0).html }}</ref> A semi-[[Structural_formula#Condensed_formulas|structural formula]] for the pyrosulfate anion is O<sub>3</sub>SOSO<sub>3</sub><sup>2<nowiki>&minus;</nowiki></sup>. The [[oxidation state]] of sulfur in this compound is +6.

==Uses==
⚫
Potassium pyrosulfate is used in [[analytical chemistry]]; samples are fused with potassium pyrosulfate, (or a mixture of potassium pyrosulfate and [[potassium fluoride]]) to ensure complete dissolution prior to a [[Quantitative analysis (chemistry)|quantitative analysis]].<ref>{{cite journal |title=Determination of quartz (free silica) in refractory clays |last=Trostbl |first=L. J. |last2=Wynne |first2=D. J. |journal=Journal of the American Ceramic Society |volume=23 |issue=1 |pages=18–22 |year=1940 |doi=10.1111/j.1151-2916.1940.tb14187.x }}</ref><ref>{{cite journal |title=Determination of gross alpha, plutonium, neptunium, and/or uranium by gross alpha counting on barium sulphate |first=C. W. |last=Sill |journal=Analytical Chemistry |year=1980 |volume=52 |issue=9 |pages=1452–1459 |doi=10.1021/ac50059a018 }}</ref>

The compound is also present in a [[catalyst]] in conjunction with [[vanadium(V) oxide]] in the industrial production of sulfur trioxide.<ref>{{cite web|last1=Burkhardt|first1=Donald|year=1965|title=Sulfur trioxide production, US3362786A|url=https://patents.google.com/patent/US3362786A/en|website=Google Patents|access-date=31 December 2015}}</ref>


==See also==
==See also==
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[[Category:Potassium compounds]]
[[Category:Potassium compounds]]
[[Category:Pyrosulfates]]
[[Category:Pyrosulfates]]

[[de:Kaliumdisulfat]]
[[it:Disolfato di potassio]]
[[nl:Kaliumpyrosulfaat]]
[[fi:Kaliumpyrosulfaatti]]
[[sv:Kaliumpyrosulfat]]

Latest revision as of 19:18, 12 June 2023

Potassium pyrosulfate
Names
IUPAC name
dipotassium (sulfonatooxy)sulfonate
Other names
Potassium pyrosulphate; potassium disulfate
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.029.288 Edit this at Wikidata
EC Number
  • 232-216-8
UNII
  • InChI=1S/2K.H2O7S2/c;;1-8(2,3)7-9(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2 ☒N
    Key: KAQHZJVQFBJKCK-UHFFFAOYSA-L ☒N
  • InChI=1/2K.H2O7S2/c;;1-8(2,3)7-9(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2
    Key: KAQHZJVQFBJKCK-NUQVWONBAQ
  • [O-]S(=O)(=O)OS(=O)(=O)[O-].[K+].[K+]
Properties
K2O7S2
Molar mass 254.31 g·mol−1
Density 2.28 g/cm3
Melting point 325 °C (617 °F; 598 K)
25.4 g/100 mL (20 °C)
Hazards
GHS labelling:
GHS05: CorrosiveGHS06: Toxic
Danger
H314, H331
P260, P261, P264, P271, P280, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P311, P321, P363, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Potassium pyrosulfate, or potassium disulfate, is an inorganic compound with the chemical formula K2S2O7.

Production

[edit]

Potassium pyrosulfate is obtained by the thermal decomposition of other salts, most directly from potassium bisulfate:[1]

2 KHSO4 → K2S2O7 + H2O

Temperatures above 600°C further decompose potassium pyrosulfate to potassium sulfate and sulfur trioxide however:[2]

K2S2O7 → K2SO4 + SO3

Other salts, such as potassium trisulfate,[3] can also decompose into potassium pyrosulfate.

Chemical structure

[edit]

Potassium pyrosulfate contains the pyrosulfate anion which has a dichromate-like structure. The geometry can be visualized as a tetrahedron with two corners sharing the SO4 anion's configuration and a centrally bridged oxygen atom.[4] A semi-structural formula for the pyrosulfate anion is O3SOSO32−. The oxidation state of sulfur in this compound is +6.

Uses

[edit]

Potassium pyrosulfate is used in analytical chemistry; samples are fused with potassium pyrosulfate, (or a mixture of potassium pyrosulfate and potassium fluoride) to ensure complete dissolution prior to a quantitative analysis.[5][6]

The compound is also present in a catalyst in conjunction with vanadium(V) oxide in the industrial production of sulfur trioxide.[7]

See also

[edit]

References

[edit]
  1. ^ Washington Wiley, Harvey (1895). Principles and Practice of Agricultural Analysis: Fertilizers. Easton, PA.: Chemical Publishing Co. p. 218. Retrieved 31 December 2015. Potassium disulfate.
  2. ^ Iredelle Dillard Hinds, John (1908). Inorganic Chemistry: With the Elements of Physical and Theoretical Chemistry. New York: John Wiley & Sons. p. 547. Retrieved 31 December 2015. Potassium disulfate.
  3. ^ Brauer, Georg (1963). Handbook of Preparative Inorganic Chemistry Vol. 2, 2nd Ed. New York: Academic Press. p. 1716. ISBN 9780323161299.
  4. ^ Ståhl, K.; Balic-Zunic, T.; da Silva, F.; Eriksen, K. M.; Berg, R. W.; Fehrmann, R. (2005). "The crystal structure determination and refinements of K2S2O7, KNaS2O7 and Na2S2O7 from X-ray powder and single crystal diffraction data". Journal of Solid State Chemistry. 178 (5): 1697–1704. Bibcode:2005JSSCh.178.1697S. doi:10.1016/j.jssc.2005.03.022.
  5. ^ Trostbl, L. J.; Wynne, D. J. (1940). "Determination of quartz (free silica) in refractory clays". Journal of the American Ceramic Society. 23 (1): 18–22. doi:10.1111/j.1151-2916.1940.tb14187.x.
  6. ^ Sill, C. W. (1980). "Determination of gross alpha, plutonium, neptunium, and/or uranium by gross alpha counting on barium sulphate". Analytical Chemistry. 52 (9): 1452–1459. doi:10.1021/ac50059a018.
  7. ^ Burkhardt, Donald (1965). "Sulfur trioxide production, US3362786A". Google Patents. Retrieved 31 December 2015.
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